mist: add page

[macownersclub]

• [X] The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• [X] The page(s) have at most 8 examples.
• [X] The page description(s) have links to documentation or a homepage.
• [X] The page(s) follow the content guidelines.
• [X] The PR title conforms to the recommended templates.
• Version of the command being documented (if known): 2.1

[CLAassistant]

All committers have signed the CLA.

[tldr-bot]

The build for this PR failed with the following error(s):

pages/osx/mist.md:8: TLDR007 Example descriptions should be surrounded by empty lines
pages/osx/mist.md:11: TLDR007 Example descriptions should be surrounded by empty lines
pages/osx/mist.md:14: TLDR007 Example descriptions should be surrounded by empty lines
pages/osx/mist.md:17: TLDR007 Example descriptions should be surrounded by empty lines
pages/osx/mist.md:20: TLDR007 Example descriptions should be surrounded by empty lines
pages/osx/mist.md:23: TLDR007 Example descriptions should be surrounded by empty lines
pages/osx/mist.md:26: TLDR007 Example descriptions should be surrounded by empty lines
pages/osx/mist.md:29: TLDR007 Example descriptions should be surrounded by empty lines

Please fix the error(s) and push again.